%0 Journal Article
%A Zalineeva, Anna
%A Baranton, Stève
%A Coutanceau, Christophe
%A Jerkiewicz, Gregory
%T Octahedral palladium nanoparticles as excellent hosts for electrochemically adsorbed and absorbed hydrogen
%D 2017
%R 10.1126/sciadv.1600542
%J Science Advances
%P e1600542
%V 3
%N 2
%X We report new results for electrochemical H adsorption on and absorption in octahedral palladium nanoparticles (Pd-NPs) with an average tip-to-tip size of 7.8 nm and a narrow size distribution. They reveal a very high H loading of 0.90 that cannot be achieved using bulk Pd materials or larger NPs; this behavior is assigned to a combination of two factors: their small size and face morphology. Temperature-dependent cyclic voltammetry (CV) studies in the range of 296 to 333 K reveal unique features that are attributed to electrochemical H adsorption, H absorption, and H2 generation. The CV features are used to prepare H adsorption and absorption isotherms that are then used in thermodynamic data analysis. Modeling of the experimental results demonstrates that, upon H adsorption and absorption, Pd-NPs develop a core-shell-skin structure, each with its unique H loading. The electrochemical results obtained for octahedral Pd-NPs are compared to analogous data obtained for cubic Pd-NPs with a similar size as well as for larger cubic Pd-NPs and bulk materials under gas-phase conditions.
%U https://advances.sciencemag.org/content/advances/3/2/e1600542.full.pdf